Max usb storage size that can be connected to Telus Wifi Hub USB white Arcadyan tower modem

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[wireless]

I am using Telus Wifi Hub USB (white Arcadyan tower modem). I have connected 1tb HDD to the modem to create Nas. I wanted to confirm what's the max allowed size usb that I can connect. I am running out of storage space and will like to increase space. For me 2 TB will be enough but if the modem supports more space then to future proof it I will go to it's max ability.

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